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ACI-ASTM CA40F Steel vs. AISI 439 Stainless Steel

Both ACI-ASTM CA40F steel and AISI 439 stainless steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA40F steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
160
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 13
23
Fatigue Strength, MPa 320
170
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
77
Tensile Strength: Ultimate (UTS), MPa 770
490
Tensile Strength: Yield (Proof), MPa 550
250

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Corrosion, °C 390
530
Maximum Temperature: Mechanical, °C 750
890
Melting Completion (Liquidus), °C 1430
1510
Melting Onset (Solidus), °C 1390
1430
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 27
25
Thermal Expansion, µm/m-K 10
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
3.4

Otherwise Unclassified Properties

Base Metal Price, % relative 7.5
9.0
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.0
2.3
Embodied Energy, MJ/kg 28
34
Embodied Water, L/kg 100
120

Common Calculations

PREN (Pitting Resistance) 14
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 94
95
Resilience: Unit (Modulus of Resilience), kJ/m3 790
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
18
Strength to Weight: Bending, points 24
18
Thermal Diffusivity, mm2/s 7.2
6.7
Thermal Shock Resistance, points 28
16

Alloy Composition

Aluminum (Al), % 0
0 to 0.15
Carbon (C), % 0.2 to 0.4
0 to 0.030
Chromium (Cr), % 11.5 to 14
17 to 19
Iron (Fe), % 81.6 to 88.3
77.1 to 82.8
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 1.0
0 to 0.5
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0.2 to 0.4
0 to 0.030
Titanium (Ti), % 0
0.2 to 1.1